Java Regex

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    String regex = "^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})$";